multiple, nested apps in Sinatra

AppNumberOne.rb

require 'rubygems'
require 'sinatra/base'

class AppNumberOne < Sinatra::Base
  get '/?' do
    "You've found App1. Go to /app2/ to find App2!"
  end
end

AppNumberTwo.rb

require 'rubygems'
require 'sinatra/base'

class AppNumberTwo < Sinatra::Base
  get '/?' do
    "Ooh! Ya found me!"
  end
end

Launcher.rb

require 'AppNumberOne'
require 'AppNumberTwo'

map '/app1' do
  run App1
end

map '/app2' do
  run App2
end